Large magnetoelectric coupling in magnetically short-range ordered Bi5Ti3FeO15 film

Multiferroic materials, which offer the possibility of manipulating the magnetic state by an electric field or vice versa, are of great current interest. However, single-phase materials with such cross-coupling properties at room temperature exist rarely in nature; new design of nano-engineered thin films with a strong magneto-electric coupling is a fundamental challenge. Here we demonstrate a robust room-temperature magneto-electric coupling in a bismuth-layer-structured ferroelectric Bi5Ti3FeO15 with high ferroelectric Curie temperature of ~1000 K. Bi5Ti3FeO15 thin films grown by pulsed laser deposition are single-phase layered perovskit with nearly (00l)-orientation. Room-temperature multiferroic behavior is demonstrated by a large modulation in magneto-polarization and magneto-dielectric responses. Local structural characterizations by transmission electron microscopy and Mössbauer spectroscopy reveal the existence of Fe-rich nanodomains, which cause a short-range magnetic ordering at ~620 K. In Bi5Ti3FeO15 with a stable ferroelectric order, the spin canting of magnetic-ion-based nanodomains via the Dzyaloshinskii-Moriya interaction might yield a robust magneto-electric coupling of ~400 mV/Oe·cm even at room temperature. © 2020 Springer Nature Limited
Magnetism, Electric fields, Ferroelectric materials, Bismuth, Electron microscopy, Thin films, Curie point, Spin
Zhao, H., Kimura, H., Cheng, Z., Osada, M., Wang, J., Wang, X., Dou, S. X., Lui, Y., Yu, J., Matsumoto, T., Tohei, T., Shibata, N., & Ikuhara, Y. (2014). Large magnetoelectric coupling in magnetically short-range ordered Bi5Ti3FeO15 film. Scientific Reports, 4(1) 5255. doi:10.1038/srep05255